<?php

class Db_Mysql {
	
	var $version = '';
	var $querynum = 0;
	public $conn;
	private $config;
	const DEFAULT_CAHRSET = 'utf8';
	
	function __construct($config = false) {
		if (! $config) {
			$this->halt ( 'Mysql config not found!' );
		}
		$this->config = $config;
		$this->connect ();
		if (DEBUG === TRUE) {echo '--- MYSQL DB construct!' . '<br/>';}
	}
	
	function connect() {
		$config = $this->config;
		$func = empty ( $config ['pconnect'] ) ? 'mysql_connect' : 'mysql_pconnect';
		if (! $this->conn = @$func ( $config ['host'], $config ['username'], $config ['password'], 1 )) {
			$this->halt ( 'Can not connect to MySQL server' );
		} else {
			if ($this->version () > '4.1') {
				$dbcharset = self::DEFAULT_CAHRSET;
				//$dbcharset = $dbcharset2 ? $dbcharset2 : $dbcharset;
				$dbcharset = ! $dbcharset && in_array ( strtolower ( $config ['charset'] ), array ('gbk', 'big5', 'utf-8' ) ) ? str_replace ( '-', '', $config ['charset'] ) : $dbcharset;
				$serverset = $dbcharset ? 'character_set_connection=' . $dbcharset . ', character_set_results=' . $dbcharset . ', character_set_client=binary' : '';
				$serverset .= $this->version () > '5.0.1' ? ((empty ( $serverset ) ? '' : ',') . 'sql_mode=\'\'') : '';
				$serverset && mysql_query ( "SET $serverset", $this->conn );
			}
			$config ['database'] && @mysql_select_db ( $config ['database'], $this->conn );
		}
	
	}
	
	function select_db($dbname) {
		return mysql_select_db ( $dbname, $this->conn );
	}
	
	function fetch_array($query, $result_type = MYSQL_ASSOC) {
		return mysql_fetch_array ( $query, $result_type );
	}
	
	function query_first($sql) {
		return $this->fetch_array ( $this->query ( $sql ) );
	}
	
	function result_first($sql) {
		return $this->result ( $this->query ( $sql ), 0 );
	}
	
	function query($sql, $type = '') {		
		$func = $type == 'UNBUFFERED' && @function_exists ( 'mysql_unbuffered_query' ) ? 'mysql_unbuffered_query' : 'mysql_query';
		if (! ($query = $func ( $sql, $this->conn ))) {
			if (in_array ( $this->errno (), array (2006, 2013 ) ) && substr ( $type, 0, 5 ) != 'RETRY') {
				$this->close ();
				require W_ROOT . './include/config.inc.php';
				$this->connect ( $dbhost, $dbuser, $dbpw, $dbname, $pconnect, true, $dbcharset );
				$this->query ( $sql, 'RETRY' . $type );
			} elseif ($type != 'SILENT' && substr ( $type, 5 ) != 'SILENT') {
				$this->halt ( 'MySQL Query Error', $sql );
			}
		}
		
		$this->querynum ++;
		return $query;
	}
	
	function affected_rows() {
		return mysql_affected_rows ( $this->conn );
	}
	
	function error() {
		return (($this->conn) ? mysql_error ( $this->conn ) : mysql_error ());
	}
	
	function errno() {
		return intval ( ($this->conn) ? mysql_errno ( $this->conn ) : mysql_errno () );
	}
	
	function result($query, $row = 0) {
		$query = @mysql_result ( $query, $row );
		return $query;
	}
	
	function num_rows($query) {
		$query = mysql_num_rows ( $query );
		return $query;
	}
	
	function num_fields($query) {
		return mysql_num_fields ( $query );
	}
	
	function free_result($query) {
		return mysql_free_result ( $query );
	}
	
	function insert_id() {
		return ($id = mysql_insert_id ( $this->conn )) >= 0 ? $id : $this->result ( $this->query ( "SELECT last_insert_id()" ), 0 );
	}
	
	function fetch_row($query) {
		$query = mysql_fetch_row ( $query );
		return $query;
	}
	
	function fetch_fields($query) {
		return mysql_fetch_field ( $query );
	}
	
	function version() {
		if (empty ( $this->version )) {
			$this->version = mysql_get_server_info ( $this->conn );
		}
		return $this->version;
	}
	
	function close() {
		return mysql_close ( $this->conn );
	}
	
	function halt($message = '', $sql = '') {
		echo $message . "<br / >";
		echo $sql;
		exit ();
	}
}

?>